TreeResetNamedSecurityInfoW-Aufrufproblem

[Remko]

Just be to be sure, why not change this line
NewSI := NewSI or PROTECTED_DACL_SECURITY_INFORMATION;
to NewSI := PROTECTED_DACL_SECURITY_INFORMATION;
because NewSi has not been given a value yet...

You're passing SELF as the Args parameter, are you doing something with this in the callback? If not, just pass nil.

Do you get the same error when using nil and ProgressInvokeNever?